a-a a-b a-t aaa aab aad aae aao aat aav ab- aba abb abd abe abo abt abv ad- ada adb add ade ado adt adv aea aeb aed aee aeo aet aev aoa aob aod aoe aoo aot aov at- ata atb atd ate ato att atv av- ava avb avd ave avo avt baa bab bad bae bao bat bav bba bbb bbd bbe bbo bbt bda bdb bdd bde bdo bdt bdv be- bea beb bed bee beo bet bev boa bob bod boe boo bot bov bta btb btd bte bto btt btv bva bvb bvd bve bvo bvt bvv daa dab dad dae dao dat dav dba dbb dbd dbe dbo dbt dbv dda ddb ddd dde ddo ddt de- dea deb ded dee deo det dev doa dob dod doe doo dot dov dta dtb dtd dte dto dtt dtv dva dvb dvd dve dvt eaa eab ead eae eao eat eav eba ebb ebd ebe ebo ebt ebv ed- eda edb edd ede edo edt eea eeb eed eee eeo eet eev eo- eoa eob eod eoe eoo eot eta etb etd ete eto ett etv eva evb evd eve evo evt evv oaa oab oad oae oao oat oav ob- oba obb obd obe obo obt obv oda odb odd ode odo odt odv oea oeb oed oee oeo oet oo- ooa oob ood ooo oot oov ot- ota otb otd ote oto ott otv ov- ova ovb ovd ove ovo ovv taa tab tad tae tao tat tav tba tbb tbd tbe tbo tbt tbv tda tdb tdd tde tdo tdt tdv te- tea teb ted tee teo tet tev to- toa tob tod toe too tot tov tta ttb ttd tte tto ttt ttv tva tvb tvd tve tvo tvt v-a v-e vaa vab vad vae vao vat vav vba vbd vbo vbv vdb vdd vde vdo vdt vdv vea veb ved vee veo vet voa vob vod voe voo vot vov vta vtb vte vto vtt vtv vva vvb vvo vvt vvv